[gtk/wip/ebassi/grid-layout] examples: Update GtkGrid definitions in UI files

[Emmanuele Bassi <ebassi src gnome org>]

commit 98a3d572844148b4f40b8c1910632da0af229c4f
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Apr 5 00:12:59 2019 +0100

    examples: Update GtkGrid definitions in UI files

 examples/builder.ui | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)
---
diff --git a/examples/builder.ui b/examples/builder.ui
index eb4c60c866..0f16026c01 100644
--- a/examples/builder.ui
+++ b/examples/builder.ui
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <object id="window" class="GtkWindow">
     <property name="title">Grid</property>
@@ -6,30 +7,30 @@
         <child>
           <object id="button1" class="GtkButton">
             <property name="label">Button 1</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object id="button2" class="GtkButton">
             <property name="label">Button 2</property>
+            <layout>
+              <property name="left-attach">1</property>
+              <property name="top-attach">0</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">1</property>
-            <property name="top-attach">0</property>
-          </packing>
         </child>
         <child>
           <object id="quit" class="GtkButton">
             <property name="label">Quit</property>
+            <layout>
+              <property name="left-attach">0</property>
+              <property name="top-attach">1</property>
+              <property name="column-span">2</property>
+            </layout>
           </object>
-          <packing>
-            <property name="left-attach">0</property>
-            <property name="top-attach">1</property>
-            <property name="width">2</property>
-          </packing>
         </child>
       </object>
     </child>